[C++ Patch] PR 19200

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

another old issue, which should be also relatively easy to fix. The 
problem is clear, for:

struct S {
  struct T{};
  friend void S(T);
};

cp_parser_direct_declarator sees a name which matches that of a kosher 
constructor and sets sfk_constructor. Then things go quickly wrong 
because a constructor cannot have a return type specification, thus 
check_special_function_return_type, called by grokdeclarator, complains.

I tried various ideas (eg, I'm also attaching an alternate approach 
passing down the friend information from cp_parser_member_declaration to 
cp_parser_direct_declarator), but, all in all, I propose to adjust 
things in grodeclarator itself. Tested x86_64-linux.

Thanks!
Paolo.

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